from django_redis import get_redis_connection
from rest_framework import serializers
from rest_framework_jwt.settings import api_settings

from oauth.models import OAuthQQUser
from oauth.utils import OAuthQQ
from users.models import User


class OauthQQUserSerializer(serializers.ModelSerializer):
    sms_code = serializers.CharField(label='短信验证码',write_only=True)
    access_token = serializers.CharField(label='操作凭证',write_only=True)
    token = serializers.CharField(read_only=True)
    mobile = serializers.RegexField(label='手机号',regex=r'^1[3-9]\d{9}$')

    class Meta:
        model = User
        fields = ('mobile','password','sms_code','access_token','id','username','token')
        extra_kwargs = {
            'username':{
                'read_only':True
            },
            'password':{
                'write_only':True,
                'min_length':8,
                'max_length':20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }

            }
        }
    def validate(self, attrs):
        # 检验access_token
        access_token = attrs['access_token']

        openid = OAuthQQ.check_bind_user_access_token(access_token)


        if not openid:
            raise serializers.ValidationError('无效的access_token')

        attrs['openid'] = openid
        # 检验短信验证码
        mobile = attrs['mobile']
        sms_code = attrs['sms_code']
        redis_conn = get_redis_connection('verify_codes')
        real_sms_code = redis_conn.get('sms_%s' % mobile)
        if real_sms_code.decode() != sms_code:
            raise serializers.ValidationError('发送短信验证失败')

        # 如果用户存在,检验用户密码
        try:
            user = User.objects.get(mobile=mobile)
        except User.DoesNotExist:
            pass

        else:
            password = attrs['password']
            if not user.check_password(password):
                raise serializers.ValidationError('密码输入有误')

            attrs['user'] = user

        return attrs

    def create(self,validated_date):
        openid = validated_date['openid']
        user = validated_date.get('user')
        mobile = validated_date['mobile']
        password = validated_date['password']

        # 如果不存在,将创建用户
        if not user:
            user = User.objects.create_user(username=mobile,mobile=mobile,password=password)

        OAuthQQUser.objects.create(user=user,openid=openid)

        # 签发JWT_token
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)

        user.token = token

        return user




